What does Dippy's name mean?

Dippy is a replica of a Diplodocus carnegii skeleton.

Diplodocus means 'double-beamed' and refers to a set of bones attached to the underside of Dippy's tail. These bones are called chevrons.

In Diplodocus, the bones near the base of the tail are similar in shape to those of other dinosaurs, but in the middle of the tail they show an odd two-pronged structure that gives the animal its name.

Carnegii is a reference to Andrew Carnegie who founded the Carnegie Museum of Natural History in 1896, where the first discovered Diplodocus carnegii skeleton is also housed. He funded the excavation of the original specimen and presented the replica as a gift to King Edward VII.